Plug for lubricating axles



'UNITED STATES PATENT OFFIOE.

ALFRED C. GARRATT, OF HANOVER, MASSACHUSETTS.

PLUG FOR LUBRICATING AXLES.

Specicaton of Letters Patent No.

To all whom, t may concern.'

Be it known that I, ALFRED O. GARRA'r'i, of Hanover, in the county of Plymouth and State of Massachusetts, have made a new and useful Invention for Facilitating the fork of Lubricating the Axles or Bearings of Carriage-Wheels; and I do hereby declare that the saine is fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

Of the said drawings Figure l represents a vertical and transverse section of the hub of a wheel and a journal of its axle, the same exhibiting my improvement as applied thereto. Figs. 2 and 3, are separate side views of the screw plug to be hereinafter described.

In carrying out my invention, I insert inthe hub A, atube B, which I cause to extend nearly or quite down to the journal C. This tube is provided with a mouth and a female screw as seen at a. Into this tube I insert a round plug of metal D, which I cause to extend down or nearly down to journal C. Within this plug I bore or make in the direcn tion of its axis a chamber b, and I also cut away the plug so as to form an opening out of the side of said chamber as seenat fl. The plug so made is to be provided with a male screw as seen at f, adapted to screw into the female screw hereinbefore mentioned.

By extending the plug entirely down through the hub and to the journal of an Aaxle and providing it, with ka chamber .as

12,238, dated January 16, 1855.

ing (Z.

Ihen oil has been inserted in the hub through its side, the oil passage has generally been provided with a simple screw nut or plug made to close its outer end. In

this case the wheel grease would soon accumulate within the oil passage and fill it.

up! so as to render it difficult if. not impos-r sibleto cause oil to pass through it; my improvement obviates the above diticulty.

IVha-t therefore I claim as my invention l The chambered screw plug open at` its lower end and having a passage made through its side and applied for removing the accumulated. wheel grease as described.V

In testimony whereof I have hereunto set my signature this eleventh day of August ALFRED C'. GARRATT. IVitnesses:

WM. R. CHAPMAN, SAML. TOLMAN. 

